Shane, When the valve (slide or piston valve) admits steam to one side of the piston, it is exhausting the steam from the other side of the piston. This model uses a slide valve. The steam from the boiler is surrounding the valve and the exhaust passageways are in the center of the block. The passage way where he said that steam enters the piston from the boiler is actually the exhaust. He has the wheel running in forwards when the valve gear is set for reverse.
Theres a few things that make the piston move. What you described is basically the last step. First, steam passes from the nozzle and expands in the cylinder, that creates the most mechanical energy. When it comes out of the cylinder and into the condenser(in a closed loop system only) the steam will contract and create a vacuum on the other side of the cylinder, helping it move that way, and draw more steam in.
I have one of these. (Slighly older) Any idea what is it worth? I'm not interested in making money. ONly wondering if it should be in a proper collection.
As a former Steam Fitter/Driver I can state that your valve timing is 180 deg out, the'engine' cannot run the way it is set. You need to rotate the eccentrics on the shaft, they have grub screws to allow this to be done. Now as a Steam Driver (current) I can also add that by 'back-gearing' the loco you do add a very effective amount of brake force. Recently whilst running at night the rails got dew on them which compromised my brakes, the train just 'picked up the wheels' and slid. By reversing I was able to stop under control very easily. I must point out that this was on a very private miniature line here in South Eastern England, the gauge is 9 inches and the loco was a 1/6 scale Lord Nelson 4-6-0 complete with four cylinders. Our trains are un-braked and we rely on the tender hand brakes. Normally this is all we need, however that night we all (three locos in steam) had problems. Please keep up the good work. Rgds, D.J.F.
If you watch the valve, when the outside edge of the valve uncovers a port to the piston, steam surrounding the valve will enter the piston to push the piston. At the same time, on the other side of the valve, the inside cavity of the valve will uncover the opposite port to the piston and exhaust the "used" steam from the piston, up through the center cavity in the valve and out the center passage way. The steam would then shoot up the blast nozzle and stack, making the chuffing sound.
What would be interesting is if someone would build one of these with adjustable connections to see how changing any setup would affect the valve. Doing it on the computer would be the easiest and fastest way. Probably the angle of the eccentric to the crankpin would have the greatest affect. There are two eccentrics because the engine also runs in reverse. These can be made for any valve gear.
mrpete222 ,that is a very nice video ty , I have 1 Q, On the example shown at what point of each stroke does the exhaust release ?? every 1 fails to explain that in vid's . ty Shane
actually, he was right. on real steam engines the sliding valve blocks off one entire side of the cylinder, and inwards flowing steam goes between the two spools. the outward flowing steam goes out of a port on either side of the valve casing that is not shown on this model.
@@BigCroca one, this comment is really damn old, second, no, this model is still incorrect, he has the valve events set in reverse for a D valve outside admission steam engine, the steam entering outside the valve pushed it against the steam chest face to hold a good seal, inside admission valve events utilize piston valves and admit the steam on the inside of the valves. It's a very basic explanation but that's the general gist of it
@@vishouscat except it isn't. when the valve moves right then steam flows into the right cylinder port and out of the left one, and vice versa. also you spelled "vicious" wrong in your name.
Shane,
When the valve (slide or piston valve) admits steam to one side of the piston, it is exhausting the steam from the other side of the piston. This model uses a slide valve. The steam from the boiler is surrounding the valve and the exhaust passageways are in the center of the block.
The passage way where he said that steam enters the piston from the boiler is actually the exhaust. He has the wheel running in forwards when the valve gear is set for reverse.
Theres a few things that make the piston move. What you described is basically the last step. First, steam passes from the nozzle and expands in the cylinder, that creates the most mechanical energy. When it comes out of the cylinder and into the condenser(in a closed loop system only) the steam will contract and create a vacuum on the other side of the cylinder, helping it move that way, and draw more steam in.
Awesome Mr pete! I know this is old but I still enjoy it.
we had steam engine lessons, while technic in school :) it was awsome, we learned steam engine first and after then the combustion engine.
Very good demonstration Mr. Pete, thanks!
I have one of these. (Slighly older) Any idea what is it worth? I'm not interested in making money. ONly wondering if it should be in a proper collection.
I have one too but inside of it is painted red
As a former Steam Fitter/Driver I can state that your valve timing is 180 deg out, the'engine' cannot run the way it is set. You need to rotate the eccentrics on the shaft, they have grub screws to allow this to be done. Now as a Steam Driver (current) I can also add that by 'back-gearing' the loco you do add a very effective amount of brake force. Recently whilst running at night the rails got dew on them which compromised my brakes, the train just 'picked up the wheels' and slid. By reversing I was able to stop under control very easily. I must point out that this was on a very private miniature line here in South Eastern England, the gauge is 9 inches and the loco was a 1/6 scale Lord Nelson 4-6-0 complete with four cylinders. Our trains are un-braked and we rely on the tender hand brakes. Normally this is all we need, however that night we all (three locos in steam) had problems. Please keep up the good work. Rgds, D.J.F.
May do that next summer. Its 10 degrees here and I do my melting outdoors.
You are demonstrating forward motion with it shifted into reverse. But otherwise very good.
If you watch the valve, when the outside edge of the valve uncovers a port to the piston, steam surrounding the valve will enter the piston to push the piston.
At the same time, on the other side of the valve, the inside cavity of the valve will uncover the opposite port to the piston and exhaust the "used" steam from the piston, up through the center cavity in the valve and out the center passage way. The steam would then shoot up the blast nozzle and stack, making the chuffing sound.
What would be interesting is if someone would build one of these with adjustable connections to see how changing any setup would affect the valve. Doing it on the computer would be the easiest and fastest way. Probably the angle of the eccentric to the crankpin would have the greatest affect. There are two eccentrics because the engine also runs in reverse.
These can be made for any valve gear.
mrpete222 ,that is a very nice video ty , I have 1 Q, On the example shown at what point of each stroke does the exhaust release ?? every 1 fails to explain that in vid's . ty Shane
Great demo.
Very nice
1:44 YOUR COMPLETELY WRONG!!!!!!!!!!!!!! The steam is entering the other port
actually, he was right. on real steam engines the sliding valve blocks off one entire side of the cylinder, and inwards flowing steam goes between the two spools. the outward flowing steam goes out of a port on either side of the valve casing that is not shown on this model.
@@BigCroca one, this comment is really damn old, second, no, this model is still incorrect, he has the valve events set in reverse for a D valve outside admission steam engine, the steam entering outside the valve pushed it against the steam chest face to hold a good seal, inside admission valve events utilize piston valves and admit the steam on the inside of the valves. It's a very basic explanation but that's the general gist of it
@@vishouscat why dont you watch it again?
@@BigCroca I am, it's still wrong.
@@vishouscat except it isn't. when the valve moves right then steam flows into the right cylinder port and out of the left one, and vice versa. also you spelled "vicious" wrong in your name.
i got one of these out of my old school, its indenticle to this but silver and red in coloring
hi there i like all your shows and thing you do a great job with them . and have learned a lot from them . i have 2 of those . thank you john
yes, the rotation must have been reverse
Yes yes the intake and exhaust we're accidentally reversed , no big deal